Bowser's Castle
Thomps are in the outfield of this ballpark. If you hit a ball right on the thomps, they might send the ball back into the park.
Donkey Kong Jungle
This is a jungle that includes a river. In the river (which divides the infield and outfield), there is Klaptraps running around. They will bite and attach themselves to players that get too close. If they are hit by a ball, you will earn a team star. They will disappear if a ball hits you while they are attached, or when the inning ends. In the outfield, there is barrel blasters that will shoot barrels at players randomly during the game.
Mario Stadium
This is a basic baseball park. There are no obstacles or powerups on the field.
Peach Garden
This park is the garden of Princess Peach's castle. It includes various blocks that can be hit for team stars. If a ball hits a music block, the ball will bounce farther. If a ball hits a brick block, it will shatter the block to reveal a team star. If a ball hits a metal block, the ball will drop instantly. The music from the original Super Mario Bros. is the theme song.
Wario Palace
This park is a desert. Chain Chomps are on the left and right field sides, and they will attack anything that disturbs them. Another obstacle is storm generators that will blow the ball away. There is also team stars hidden in the sand.
Yoshi Park
This park is a grass field. It features Piranha Plants that will attack players that come too close. They will eat the ball and spit it out somewhere else. If they are hit with a ball, they will produce a team star.